Tad Is a Vice-President of Ruby Corporation

Tad is a vice-president of Ruby Corporation.In 2011,he acquired 500 shares of Ruby Corporation stock under the corporation's incentive stock option (ISO) plan for an option price of $33 per share.At the date of exercise in 2011,the fair market value of the stock was $43 per share.The stock became freely transferable in 2015.Tad sold the 500 shares for $50 per share in 2013.Which of the following statements is incorrect?

A) Acquisition of the stock in 2011 had no effect on Tad's taxable income, but increased AMTI by $5,000 in 2011.
B) Tad's regular income tax basis for the stock is $33,000 and his AMT basis is $43,000 in 2011.
C) Tad must report a positive AMT adjustment of $5,000 in 2015.
D) Tad will have a negative AMT adjustment of $5,000 in 2013.
E) All of the above are correct.